Bottom surface portion of a shoe outsole



FIG. 1 is a bottom plan view of a bottom surface portion of a shoe outsole showing my new design;

FIG. 2 is a left rear perspective view thereof;

FIG. 3 is a right rear perspective view thereof; and,

FIG. 4 is a front perspective view thereof.

The uneven broken line showing of the remainder of the shoe outsole is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bottom surface portion of a shoe outsole, as shown and described. 